Fibe shield



May a, 192s.

M. J. STRZELECK! FIRE SHIELD Filed Feb. 27. 1926 Fey, 1

Patented May 8, 1928.

UNITEDSTATES PATENT OFFICE.

MICHAEL J. STRZELEGKI, OF EAST CLEVELAND, OHIO.

FIRE SHIELD.

' Application filedFebruary 27,1926. Scria1No.91,094.

My invention relates to fire shields and particularly to shields adapted to be sus pended above the fire in the fire pot of furnaces. It is an object of my improved structure to enable the greatest possible amount of heat -from combustion oi fuel in fire pots to be retained in a particular Zone of the space in'these pots, permitting the lowest ratio of such heat to be lost'by convect-ion so far remote irom the furnace walls that much of the heat is carried out through the smoke tube; f

.It is a further object of my improved structure to provide my fire shield as a. hood form oi shield which maybe suspended in an inverted position over the central portion of the fire in the pot leaving a restricted annular space about the edge oi? the shield which directs the heated gas currents posi tively out around such edge thus directing them againstthe walls of the fire potand deriving the largest possible heat units from the fuel and heating the said walls for the purpose of heating the chosen agency for conveying the units to the ultimate parts to I be heated, such agency being easily either air or water, the action of the shield in economy of fuel in the fire pot, being similar in either case. i In the drawings accompanying and forming a part of this application- Figure 1 is a central, vertical section of an inner wall of a furnace provided with an improved fire shield;

Figure 2 is a plan view of such a shield, and Y Y I Figure 3 is a detail view of a notched bar for suspending the shield adjustably from a bar above the fire.

The same partisdesijgnated by the same reference character throughout the several views. g

Upon the grate 5 is supported. the fuel 6 above the usual ash pot 7, the waist 8 being shown as enveloping the flame section which, it unobstructed therea'bove, would normally rise centrally in the fire pot directly towards the smoke fine 9 and 'a large proportion of theunburned carbon of whatever fuel is used, would pass out through such flue, both disagreeably blackening the atmosphere in the vicinity of the chunney and indicating a positive loss of heat to the consumer due to lack of full combustion of the fuel carbon-s. Much of the loss of heat units in the ordinary fire pot, is due to the direct current of gases from the fuel centrally toward the smokefiue, as stated above and this loss can very largely be neutralized by a novel and improved'shield suspended directly over the center portion of the fuel, leaving an annular space 10 about the shield edgesso that the flame and burning gases will rise upward as before until prevented from rising directly upward to a greater height, when the gases and flames will be directed radially outward, thus directing them against the innersurface of the furnace wall 11 which is just the desired result hoped for. l

Numeral 12 designates the furnace section holding the fuel, 18designa'tes the fire dome, and 14. the hood directing the smoke and other light gases'to the'fiue 15 leading to they chimney. I provide a shieldlti of fire clay, certain metal elements being provided to Suspend the shield over the fire, a staple 17 u ing attached to the shield and therebytorn'i ing a loop to which is connected the hook 18 or an elongated bar 19 having a series of open notches'QO at the opposite end designed The shield is most advantageously made oi concavo-convex form'and the stapled? is properly attached to the convex surtr-icc .so'

that the open concave surface is directed downward towards the fire. 1 The shield. will prevent the heat rays from moving directly upward but will make certain the radial di rection of the said rays outward from the central portion of the shield against the walls of the fire pot, as indicated by the an rows in Fig. 1 of the drawings. The larger the shield, the smaller the annular space between the shield edges and the vt'uruace walls. An advantage of the convex form of the upper surface of the shield lies in the tendency of fuel falling upon it toslide oil onto the fire, and the usual position of the fuel door 23 somewhat higher than the shield makes this tendency the more strikin The rod 21 has one end flattened somewhat at 24 to receive therein the extension screw 25 acting reversely to the direction of the usual turn-buckle. 'By this means, the rod 21 secured in proper position by the screw.

that ordinarily material that is not destroyed by intense heat, serves the purpose excellently of deflecting; heat raysfroni'the' lower concave surface of the shield and directs them outward toward the furnace walls and perniitsth e upward deflection thereof about theed 'es of the shield.

Ojiemte'oia in operation, the supporting rod 21 is mounted in the hood 1a of the furnace with one end extending into the smoke fine 9 and the other end extended "against the inner surface of the hood wall, the screw device 25b'eing elongated with its upper end contacting the surface of the fine and the lower ends forced against the flat surface 24;, so that the rod 21 is held in adjusted position adapted to the size and particular shape of the furnace interior and permitting ready mounting or removal of the rod. The bar 19 is then attached to the staple 17 of the shield 16 and the two parts attached to the interior of the furnace in the manner shown in Fig. 1. The notches 20 make vertical adjustment of the bar and shield attached thereto very convenient to accommodate the shield to both the amount of fuel in the fire pot at a given time, and also to the height of a particular furnace. i

It is well known that much heat from concentrated fuel such as coal and coke, is ordinarily lost because of the large radius of the fire interior,,the heat rays moving nearest the furnace walls being most effective in heating the vicinity immediately outside of such walls, whether such outer space he a chamber for air currents, a, space for water currents, or other means of heat distrib'u tiou. Therefore, the concentration of heat rays in the animlar space nearest such walls will be most effective in resulting in economy of fuel. This I have effected by the centralv ly-mounted shield as above described.

to" the central convex surface of the said plate. an elongated rod having a flat end adapted to be inserted in thesaid flue, adustable means within the fine for' pressing heat-resisting material having aconcave sur} face on one side thereof, and a convex; sur face having a supportmg stap'le therein, and

means for adjustably suspending the plateat a slight distance above the central portion of.

the fire in said furnace, said means including a bar having a hook at one end for engaging, said stapleand a notched edge at the other end, a rod mounted horizontally across the furnace in alinement with the fine and engaging selectively the notches of the bar, and clamping means within the fine for detachably supporting the said rod. 4 i

3. In combination with afurnace having a smoke flueleading from its upper portion a shield of heat'resist-lng material havm alf,

convex surface on one side, an elong rod located above the combustion chambt the furnace and extending into thefsmoke flue, means within the fine for detachably.

holdingthe rod in position, a staple secured, to the convex surface of the shield, and a.

bar having ahoolr at one end for enga mg the said staple to suspend the shield over the fire and a series of notches adjacent the other end of the barand inclined toward the hook end for selectively engaging" the said ltlt) rod. so that the shield will be detachabl'y" mounted at varying'distances from the fire.

4. In combination with a furnace having a smoke flue leading from its upper portion, a substantiallycircular plate of heat resist-- inp; material of concavo-convei: form. the convex surface having a supporting'staple therein, means for adjustably suspending the plate at a. slight distance above th central portion of the fire in the furnace, said means including a bar having a hook at one end for engaging said staple and a notched edge at the other end, a. rod mounted horizontally across the furnace in alinemen't with thedhie and engaging selectively the notchesof the bar, and having a flat end adapted to be inserted in the said fine, and a rotatable entem sion screw positioned detachably within the fine with one end' pressing downwardly upon the flat end of the rodand the u'pper en d pressing against the upper surfaceot the hue and provided with a polygonal head for actuating the screw.

In witness whereofl have hereunto set my hand this 22nd day of February, 1926 MICHAEL J. STBZELE QKI 

